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BQ40Z80: Temperature compensation

Kunny
Prodigy 240 points
Part Number: BQ40Z80
Other Parts Discussed in Thread: GPCRB

Dear support

We would like to ask that parameter of RemainingCapacity or  RuntimeToEmpty have temparature-conpensated value or not on the device of BQ40Z80 we started using in our application.

At temperatures as low as -5 degree centigrade, the these values do not seem to be correct. And at temperature as high as 40 degree centigrade, the same happens.

In short, Li-ion battery has enough capacity left to be worked in our application, but some of cell-voltages has gone under the lower limitation of voltage.

That causes power failure of our system.

Of course we think that ChemID are correct as we have asked and confirmed before, and learning has completed well.

Could you please help us out giving a simple answer?

Thank you in advance.

Kunny

  • 0
    TI__Guru** 105760 points

    Hello Kunny,

    For extreme temperatures you will need to complete the GPCRB process, this allows for more extreme temperature gauging.

    The values reported by the gauge are temperature compensated. If the voltages hit the termination voltage this will immediately trigger the gauge to report 0%SOC.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 240 points

    Hello Wyatt

    Thank you for your quick and simple reply.

    I thought I could get the values proportional to the any ambient temperature in our system without any compensations after complete leaning cycle.

    Let me be clear that If I need the value like RSOC with using in wide range of temperature like -5 to 40deg.C, this GPCRB procedure absolutely needs, right?

    Perhaps, is there any possibility that learning cycle has failed (or something other settings are wrong) but seems good in spite of 1%MaxError?

    Best regards,

    Kunny

  • 0 in reply to Kunny
    TI__Guru** 105760 points

    Hello Kunny,

    Our algorithm always takes into account the temperature when calculating gauging parameters like FCC, RemCap, RSOC.

    If you see accurate gauging at room temperature and the accuracy degrades at extreme temperatures, then yes the GPCRB should help increase the accuracy at those temperatures.

    There are certain parameters that can change the gauge operation at extreme temperatures, but if it's accurate at room temperature the GPCRB tool is the best option.

    Sincerely,

    Wyatt Keller